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Finding the Fourth Proportional to 221,490.70, 332,236.05 and 81,231.10

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Solution

The fourth proportional to 221,490.70, 332,236.05 and 81,231.10 is: 121,846.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,490.70 : 332,236.05 = 81,231.10 : x
  2. Step 2: Convert to fraction form
    221,490.70/332,236.05 = 81,231.10/x
  3. Step 3: Cross multiply
    221,490.70x = 332,236.05 × 81,231.10
  4. Step 4: Simplify right side
    221,490.70x = 26,987,899,801.16
  5. Step 5: Solve for x
    x = 26,987,899,801.16/221,490.70
  6. Step 6: Final answer
    x = 121,846.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.